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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc62213b97873f96d9f69e8d2de80ba333c77d3205af3e40f6810e6624c33ff8' 
  AND token = 'ZaKWg7ks110neFMJY+ipYUD7XHXUUuXVbDywgaqJk9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}